| 摘要 |
PURPOSE:To produce semipermeable compound film having improved salt- excluding rate by allowing hydrocarbon solns. having different concns. of a polyfunctional reagent to contact with a layer of an aq. soln. of an amine compd. coated on a porous supporting body while carrying out the contact in two stages. CONSTITUTION:For example, after coating the surface of a fiberreinforced polysulfone supporting body with aq. soln. of a compd. having >=2 reactive amino groups such as metaphenylenediamine, by dipping the supporting body in the soln., a hydrocarbon soln. of a polyfunctioanl reagent such as trimesic chloride in the soln. of 1,1,2-trichloro-1,2,2-trifluoroethane is coated on the supporting body (first stage treatment). Further, a hydrocabon soln. of the polyfunctional reagent diluted to lower concn. than in the first stage treatment is coated on the surface of the film, then the film is dried, thusobtg. a compound film. |
